Set Language in worpress instaled in Debian (4 posts)

I want to put it in Spanish language. I have downloaded the es_ES.mo file and put it in wp-content/languages/

In debian instaled way /usr/share/wordpress/wp-config.php is a link to /etc/wordpress/wp-config.php and wp-config.php contents:
<?php
/** WordPress's Debianised default master config file
Please do NOT edit and read about how the configuration works in the README.Debian
**/